Spotify.NET/SpotifyAPI/SpoitfyLocalAPI/SpotifyMusicHandler.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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using System.Runtime.InteropServices;
using System.Windows.Forms;
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using System.IO;
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namespace SpotifyAPI.SpotifyLocalAPI
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{
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public class SpotifyMusicHandler
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{
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[DllImport("user32.dll")]
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private static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);
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[DllImport("nircmd.dll")]
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private static extern bool DoNirCmd(String NirCmdStr);
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RemoteHandler rh;
StatusResponse sr;
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//Constants for the Keyboard Event (NextTrack + PreviousTrack)
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const byte VK_MEDIA_NEXT_TRACK = 0xb0;
const byte VK_MEDIA_PREV_TRACK = 0xb1;
const int KEYEVENTF_EXTENDEDKEY = 0x1;
const int KEYEVENTF_KEYUP = 0x2;
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public SpotifyMusicHandler()
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{
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rh = RemoteHandler.GetInstance();
}
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/// <summary>
/// Simulates a KeyPress
/// </summary>
/// <param name="keyCode">The keycode for the represented Key</param>
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void PressKey(byte keyCode)
{
keybd_event(keyCode, 0x45, KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(keyCode, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}
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/// <summary>
/// Checks if a song is playing
/// </summary>
/// <returns>True if a song is playing, false if not</returns>
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public Boolean IsPlaying()
{
return sr.playing;
}
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/// <summary>
/// Returns the current Volume
/// </summary>
/// <returns>A value between 0 and 1</returns>
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public double GetVolume()
{
return sr.volume;
}
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/// <summary>
/// Plays a Spotify URI within an optional context.
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/// </summary>
/// <param name="uri">The Spotify URI. Can be checked with <seealso cref="SpotifyLocalAPIClass.IsValidSpotifyURI"/></param>
/// <param name="context">The context in which to play the specified <paramref name="uri"/>. </param>
/// <remarks>
/// Contexts are basically a queue in spotify. a song can be played within a context, meaning that hitting next / previous would lead to another song. Contexts are leveraged by widgets as described in the "Multiple tracks player" section of the following documentation page: https://developer.spotify.com/technologies/widgets/spotify-play-button/
/// </remarks>
public void PlayURL(String uri, String context = "")
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{
rh.SendPlayRequest(uri, context);
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}
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/// <summary>
/// Adds a Spotify URI to the Queue
/// </summary>
/// <param name="uri">The Spotify URI. Can be checked with <seealso cref="SpotifyLocalAPIClass.IsValidSpotifyURI"/></param>
public void AddToQueue(String uri)
{
rh.SendQueueRequest(uri);
}
/// <summary>
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/// Checks if the current "Track" is an Advert
/// </summary>
/// <returns>True if it's an Advert, false if not</returns>
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public Boolean IsAdRunning()
{
return !sr.next_enabled && !sr.prev_enabled;
}
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/// <summary>
/// Returns the current Track object
/// </summary>
/// <returns>Returns the current track object</returns>
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public Track GetCurrentTrack()
{
return sr.track;
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}
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/// <summary>
/// Skips the current song (Using keypress simulation)
/// </summary>
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public void Skip()
{
PressKey(VK_MEDIA_NEXT_TRACK);
}
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/// <summary>
/// Emulates the "Previous" Key (Using keypress simulation)
/// </summary>
public void Previous()
{
PressKey(VK_MEDIA_PREV_TRACK);
}
/// <summary>
/// Returns the current track postion
/// </summary>
/// <returns>A double between 0 and ∞</returns>
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public double GetTrackPosition()
{
return sr.playing_position;
}
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/// <summary>
/// Mutes Spotify (Requires nircmd.dll)
/// </summary>
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public void Mute()
{
if(File.Exists("nircmd.dll"))
DoNirCmd("muteappvolume spotify.exe 1");
}
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/// <summary>
/// Unmutes Spotify (Requires nircmd.dll)
/// </summary>
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public void UnMute()
{
if (File.Exists("nircmd.dll"))
DoNirCmd("muteappvolume spotify.exe 0");
}
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/// <summary>
/// Pause function
/// </summary>
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public void Pause()
{
rh.SendPauseRequest();
}
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/// <summary>
/// Play function
/// </summary>
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public void Play()
{
rh.SendPlayRequest();
}
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/// <summary>
/// Returns all Informations gathered by the JSON Request
/// </summary>
/// <returns>A StatusResponse object</returns>
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public StatusResponse GetStatusResponse()
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{
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return sr;
}
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//Used internaly
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internal void Update(StatusResponse sr)
{
this.sr = sr;
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}
}
}